From: Jeffrey A Law <law@cygnus.com>
Date: Thu, 27 Nov 1997 19:23:00 +0000 (+0000)
Subject: unroll.c (find_splittable_givs): Don't split givs with a dest_reg that was created... 
X-Git-Tag: releases/egcs-1.0.0~32
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8ea8344137367f231a5ebbac2dd671d4d35204f7;p=thirdparty%2Fgcc.git

unroll.c (find_splittable_givs): Don't split givs with a dest_reg that was created by loop.

        * unroll.c (find_splittable_givs): Don't split givs with a dest_reg
        that was created by loop.
Fixes bzip2 bug.

From-SVN: r16802
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 588a7d65b2ea..acaa173f91b7 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+Thu Nov 27 12:20:19 1997  Jeffrey A Law  (law@cygnus.com)
+
+	* unroll.c (find_splittable_givs): Don't split givs with a dest_reg
+	that was created by loop.
+
 Thu Nov 27 09:34:58 1997  Jason Merrill  <jason@yorick.cygnus.com>
 
 	* expr.c (preexpand_calls): Don't look past a TRY_CATCH_EXPR.
diff --git a/gcc/unroll.c b/gcc/unroll.c
index 0c298751685a..eccd09f3232f 100644
--- a/gcc/unroll.c
+++ b/gcc/unroll.c
@@ -2667,6 +2667,12 @@ find_splittable_givs (bl, unroll_type, loop_start, loop_end, increment,
     {
       rtx giv_inc, value;
 
+      
+      /* If this is a new register, can't handle it since it does not have
+	 an entry in reg_n_info.  */
+      if (REGNO (v->dest_reg) >= max_reg_before_loop)
+	continue;
+
       /* Only split the giv if it has already been reduced, or if the loop is
 	 being completely unrolled.  */
       if (unroll_type != UNROLL_COMPLETELY && v->ignore)